<template>
	<view class="canvasBox">
		<view class="box">
			<view class="line"></view>
			<view class="angle"></view>
		</view>
		<view class="box2" v-if="isUseTorch">
			<view class="track" @click="openTrack">
				<svg t="1653920715959" class="icon" viewBox="0 0 1024 1024" version="1.1"
					xmlns="http://www.w3.org/2000/svg" p-id="1351" width="32" height="32">
					<path
						d="M651.353043 550.479503H378.752795L240.862609 364.315031c-3.688944-4.897391-5.660621-10.876025-5.660621-17.045466v-60.040745c0-15.773416 12.847702-28.621118 28.621118-28.621118h502.459627c15.773416 0 28.621118 12.847702 28.621118 28.621118v59.977143c0 6.105839-1.971677 12.084472-5.660621 17.045466l-137.890187 186.228074zM378.752795 598.308571v398.024348c0 15.328199 12.402484 27.667081 27.667081 27.667081h217.266087c15.328199 0 27.667081-12.402484 27.66708-27.667081V598.308571H378.752795z m136.300124 176.942112c-14.564969 0-26.331429-11.76646-26.331428-26.331428v-81.283975c0-14.564969 11.76646-26.331429 26.331428-26.331429 14.564969 0 26.331429 11.76646 26.331429 26.331429v81.283975c0 14.564969-11.76646 26.331429-26.331429 26.331428zM512 222.608696c-17.554286 0-31.801242-14.246957-31.801242-31.801243V31.801242c0-17.554286 14.246957-31.801242 31.801242-31.801242s31.801242 14.246957 31.801242 31.801242v159.006211c0 17.554286-14.246957 31.801242-31.801242 31.801243zM280.932174 205.881242c-9.47677 0-18.889938-4.197764-25.122981-12.275279L158.242981 67.991056a31.864845 31.864845 0 0 1 5.597019-44.648944 31.864845 31.864845 0 0 1 44.648944 5.597018l97.502609 125.551305a31.864845 31.864845 0 0 1-5.597019 44.648944c-5.787826 4.579379-12.656894 6.741863-19.46236 6.741863zM723.987081 205.881242c-6.805466 0-13.674534-2.162484-19.462361-6.678261a31.794882 31.794882 0 0 1-5.597018-44.648944l97.566211-125.551304a31.794882 31.794882 0 0 1 44.648944-5.597019 31.794882 31.794882 0 0 1 5.597019 44.648944l-97.566211 125.551305c-6.360248 8.077516-15.709814 12.27528-25.186584 12.275279z"
						fill="#ffffff" p-id="1352"></path>
				</svg>
				{{ trackStatus ? '关闭闪光灯' : '打开闪光灯' }}
			</view>
		</view>
		<view class="mask1 mask" :style="'height:' + maskHeight + 'px;'"></view>
		<view class="mask2 mask" :style="'width:' + maskWidth + 'px;top:' + maskHeight + 'px'"></view>
		<view class="mask3 mask" :style="'height:' + maskHeight + 'px;'"></view>
		<view class="mask4 mask" :style="'width:' + maskWidth + 'px;top:' + maskHeight + 'px'"></view>
	</view>
</template>
<script>
	import Quagga from './quagga.min.js'
	export default {
		props: {
			continue: {
				type: Boolean,
				default: false // false 监听一次   true 持续监听
			},
			exact: {
				type: String,
				default: 'environment' // environment 后摄像头  user 前摄像头
			},
			definition: {
				type: Boolean,
				default: false // fasle 正常  true 高清
			},
			readers: {
				// 一维码类型
				type: Array,
				default: () => ['code_128_reader']
			}
		},
		data() {
			return {
				windowWidth: 0,
				windowHeight: 0,
				video: null,
				canvas2d: null,
				canvasDom: null,
				canvasDom2: null, // 用于画框
				canvas2d2: null,
				canvasWidth: 300,
				canvasHeight: 200,
				maskWidth: 0,
				maskHeight: 0,
				cpu: 1,
				inter: 0,

				track: null,
				isUseTorch: false,
				trackStatus: false,

				isParse: false,

				data1: '',
				data2: ''
			}
		},
		mounted() {
			if (origin.indexOf('https') === -1) throw '请在 https 环境中使用摄像头组件。'

			this.windowWidth = document.documentElement.clientWidth || document.body.clientWidth
			this.windowHeight = document.documentElement.clientHeight || document.body.clientHeight
			this.isParse = true
			this.$nextTick(() => {
				this.video = document.createElement('video')
				this.video.width = this.windowWidth
				this.video.height = this.windowHeight

				const canvas = document.createElement('canvas')
				this.canvas = canvas
				canvas.id = 'canvas'
				canvas.width = this.canvasWidth
				canvas.height = this.canvasHeight
				canvas.style = 'display:none;'

				// 设置当前宽高 满屏
				const canvasBox = document.querySelector('.canvasBox')
				canvasBox.append(this.video)
				canvasBox.append(canvas)
				canvasBox.style = `width:${this.windowWidth}px;height:${this.windowHeight}px;`

				this.canvas2d = canvas.getContext('2d')

				// 创建第二个canvas
				const canvas2 = document.createElement('canvas')
				this.canvas2 = canvas2
				canvas2.id = 'canvas2'
				canvas2.width = this.canvasWidth
				canvas2.height = this.canvasHeight
				canvas2.style =
					'position: absolute;top: 50%;left: 50%;z-index: 20;transform: translate(-50%, -50%);'
				this.canvas2d2 = canvas2.getContext('2d')
				canvasBox.append(canvas2)

				this.cpu = 1 // navigator.hardwareConcurrency || 1
				//	console.log(navigator.hardwareConcurrency )

				this.createMsk()
				setTimeout(() => {
					this.openScan()
				}, 500)
			})
		},
		methods: {
			openScan() {
				let width = this.transtion(this.windowHeight)
				let height = this.transtion(this.windowWidth)

				const videoParam = {
					audio: false,
					video: {
						facingMode: {
							exact: this.exact
						},
						width,
						height
					}
				}

				navigator.mediaDevices
					.getUserMedia(videoParam)
					.then(stream => {
						this.video.srcObject = stream
						this.video.setAttribute('playsinline', true)
						this.video.play()
						this.tick()

						this.track = stream.getVideoTracks()[0]
						setTimeout(() => {
							this.isUseTorch = this.track.getCapabilities().torch || null
						}, 500)
					})
					.catch(err => {
						console.log('设备不支持', err)
					})
			},
			tick() {
				if (!this.isParse) return
				try {
					if (this.video.readyState === this.video.HAVE_ENOUGH_DATA) {
						this.canvas2d.drawImage(
							this.video,
							this.transtion(this.maskWidth),
							this.transtion(this.maskHeight),
							this.transtion(300),
							this.transtion(200),
							0,
							0,
							this.canvasWidth,
							this.canvasHeight
						)
						const img = this.canvas.toDataURL('image/jpg')

						Quagga.decodeSingle({
								inputStream: {
									size: 300 * 2
								},
								locator: {
									patchSize: 'large',
									halfSample: true
								},
								numOfWorkers: this.cpu,
								decoder: {
									readers: this.readers
								},
								locate: true,
								src: img
							},
							result => {
								this.canvas2d2.clearRect(0, 0, this.canvasWidth, this.canvasHeight)
								requestAnimationFrame(this.tick)
								if (!result || !result.codeResult) return

								if (!this.data1) return (this.data1 = result.codeResult.code)
								this.data2 = result.codeResult.code
								console.log(this.data1, '-', this.data2)
								if (this.data2 !== this.data1) return (this.data1 = '')
								this.drawLine(result.box, result.line)
								if (!this.continue) {
									this.closeCamera()
								}
								this.$emit('success', result.codeResult.code)
							}
						)
					} else {
						requestAnimationFrame(this.tick)
					}
				} catch (e) {
					console.log('出错了');
					requestAnimationFrame(this.tick)
				}
			},

			drawLine(box, line) {
				if (!line[0] || !line[0]['x']) return
				this.canvas2d2.beginPath()
				this.canvas2d2.moveTo(line[0]['x'] / 2, line[0]['y'] / 2)
				this.canvas2d2.lineTo(line[1]['x'] / 2, line[1]['y'] / 2)
				this.canvas2d2.lineWidth = 2
				this.canvas2d2.strokeStyle = '#FF3B58'
				this.canvas2d2.stroke()
			},

			createMsk() {
				this.maskWidth = this.windowWidth / 2 - 150
				this.maskHeight = this.windowHeight / 2 - 100
			},
			closeCamera() {
				this.isParse = false
				if (this.video.srcObject) {
					this.video.srcObject.getTracks().forEach(track => {
						track.stop()
					})
				}
			},

			transtion(number) {
				return this.definition ? number * 2.6 : number * 1.6
			},

			openTrack() {
				this.trackStatus = !this.trackStatus
				this.track.applyConstraints({
					advanced: [{
						torch: this.trackStatus
					}]
				})
			}
		},
		beforeDestroy() {
			this.closeCamera()
		}
	}
</script>
<style scoped>
	page {
		background-color: #333333;
	}

	.canvasBox {
		width: 100vw;
		position: relative;

		background-image: linear-gradient(0deg,
				transparent 24%,
				rgba(32, 255, 77, 0.1) 25%,
				rgba(32, 255, 77, 0.1) 26%,
				transparent 27%,
				transparent 74%,
				rgba(32, 255, 77, 0.1) 75%,
				rgba(32, 255, 77, 0.1) 76%,
				transparent 77%,
				transparent),
			linear-gradient(90deg,
				transparent 24%,
				rgba(32, 255, 77, 0.1) 25%,
				rgba(32, 255, 77, 0.1) 26%,
				transparent 27%,
				transparent 74%,
				rgba(32, 255, 77, 0.1) 75%,
				rgba(32, 255, 77, 0.1) 76%,
				transparent 77%,
				transparent);
		background-size: 3rem 3rem;
		background-position: -1rem -1rem;
		z-index: 10;
		background-color: #1110;
	}

	.box {
		width: 300px;
		height: 200px;
		position: absolute;
		left: 50%;
		top: 50%;
		transform: translate(-50%, -50%);
		overflow: hidden;
		border: 0.1rem solid rgba(0, 255, 51, 0.2);
		z-index: 11;
	}

	.line {
		height: calc(100% - 2px);
		width: 100%;
		background: linear-gradient(180deg, rgba(0, 255, 51, 0) 43%, #00ff33 211%);
		border-bottom: 3px solid #00ff33;
		transform: translateY(-100%);
		animation: radar-beam 2s infinite alternate;
		animation-timing-function: cubic-bezier(0.53, 0, 0.43, 0.99);
		animation-delay: 1.4s;
	}

	.box2 {
		width: 300px;
		height: 200px;
		position: absolute;
		left: 50%;
		top: 50%;
		transform: translate(-50%, -50%);
		z-index: 20;
	}

	.track {
		position: absolute;
		bottom: -100px;
		left: 50%;
		transform: translateX(-50%);
		z-index: 20;
		color: #fff;
		display: flex;
		flex-direction: column;
		align-items: center;
	}

	.box:after,
	.box:before,
	.angle:after,
	.angle:before {
		content: '';
		display: block;
		position: absolute;
		width: 3vw;
		height: 3vw;
		z-index: 12;
		border: 0.2rem solid transparent;
	}

	.box:after,
	.box:before {
		top: 0;
		border-top-color: #00ff33;
	}

	.angle:after,
	.angle:before {
		bottom: 0;
		border-bottom-color: #00ff33;
	}

	.box:before,
	.angle:before {
		left: 0;
		border-left-color: #00ff33;
	}

	.box:after,
	.angle:after {
		right: 0;
		border-right-color: #00ff33;
	}

	@keyframes radar-beam {
		0% {
			transform: translateY(-100%);
		}

		100% {
			transform: translateY(0);
		}
	}

	.msg {
		text-align: center;
		padding: 20rpx 0;
	}

	.mask {
		position: absolute;
		z-index: 10;
		background-color: rgba(0, 0, 0, 0.55);
	}

	.mask1 {
		top: 0;
		left: 0;
		right: 0;
	}

	.mask2 {
		right: 0;
		height: 200px;
	}

	.mask3 {
		right: 0;
		left: 0;
		bottom: 0;
	}

	.mask4 {
		left: 0;
		height: 200px;
	}
</style>
